Skyjacker D400CDAK-X 4 In. Suspension Lift Kit with ADX 2.0 Remote Reservoir Shocks – Cummins Diesel

The Skyjacker D400CDAK-X is a complete 4-inch suspension lift kit engineered specifically for Dodge W250 and W350 Cummins diesel trucks. This kit combines diesel-specific Skyjacker Softride® front leaf springs and rear add-a-leafs with the brand's premium ADX 2.0 Adventure Series Remote Reservoir Aluminum Monotube Shocks, delivering a purpose-built solution for serious off-road performance without sacrificing everyday ride quality.

Skyjacker's Softride® leaf springs are individually shot-peened for increased tensile strength and feature tapered leaves that distribute load more evenly and promote greater flex at the leaf ends. Teflon® wear pads between each leaf, combined with bolt-style spring clips, eliminate interleaf friction and binding. These front springs are diesel-specific, engineered to handle the added weight of a Cummins powerplant while maximizing wheel travel and long-term durability.

On the rear, the OEM leaf springs are retained while a high-quality add-a-leaf kit provides the rear lift, along with the necessary u-bolt hardware. This approach preserves payload capacity while achieving the full 4-inch lift height.

The ADX 2.0 Adventure Series shocks feature an off-road race-inspired full-displaced valving system housed in a lightweight aluminum monotube body for superior heat dissipation. An external remote reservoir separates nitrogen gas from shock oil via an Internal Floating Piston (IFP), preventing cavitation and delivering the fastest possible shock reaction time. The ADX 2.0 is engineered for high-speed off-road use while still performing precisely at low crawling speeds.

Key Features:

• 4-inch suspension lift height
• Diesel-specific Skyjacker Softride® replacement front leaf springs
• Shot-peened leaves with tapered design for improved load distribution and flex
• Teflon® wear pads and bolt-style clips to eliminate interleaf friction
• Rear add-a-leaf kit retains OEM rear leaf springs
• ADX 2.0 Adventure Series Remote Reservoir Aluminum Monotube Shocks
• Internal Floating Piston (IFP) nitrogen charging for cavitation-free performance
• Race-inspired full-displaced valving system — effective at high speed and crawl
• Includes front u-bolt kit and polyurethane spring eye bushings with replacement sleeves
• All necessary mounting hardware and detailed installation instructions included
• Components powder-coated black for corrosion resistance
• Limited lifetime warranty

Additional Parts That May Be Required:

• Pitman Arm: DA20
• Adjustable Drag Link: DL10
• Front Sway Bar Lowering Kit (if equipped): SBL20
• Brake Lines: FBL60 (front) and RBL60 (rear) recommended